Azo dye.



- No Drawing.

mm STATEMENT OFFICE" IBERNI-IARD RICHARD, F BAsELQswITzERLAND, assrenon T0 ANILINE COLOR & ace: woitKs, FOBMERLY JOHN R. GEJIGY, or BASEL, SWITZERLAND.

Azo DYE.

subject of the German Emperor, and resident of Basel, in Switzerland, have inventedcertain new and useful Improvements in Azo Dyes, of which the followlng 1s a specificatioin,

Many azo dyes containing "phenol as a component are so sensitive toalkalis that their use as dyes is practically excluded. Such compounds have hitherto been alkylated in order to avoid this disadvantage.

'I have,found that this sensitiveness to alkalis may be prevented by substituting the hydrogen atom offthe phenolic hydroxyl group by an arylsulfonyl residue.

I have found that thedyeing character of wool dyes is not ,altered by introducing an arylsulfonyl group, but their shade is changed, and they are no longer sensitive to alkali. If however, the starting materials have beendirect coloring matters, such as derivatives of paradiamms, or other dye stuffs dyeing cotton without a mordant, then, as a rule, their affinity to cotton is considerably weakened. Such dyes are, on the other hand, very well suited for dyeing wool and silk, and are faster to washing and 1nilling than the corresp(indin alkyl derivatives. In certain cases however, the dyeing character of a direct d-yesiuff is not altered, as for example in the case of arnica yellow (see Schulz and Julius Fa-r-ostofftabalien, 4th edition, page 52 No. 144. Nitrosostilbenedisulfonicacid-azo-phenol.)

The introduction of the arylsulfonyl group is best accomplished by well stirring an aqueous suspension of the dye containing sodium carbonate or sodium hydroxid with an arylsulfonylchlorid until the coloring matter is no longer sensitive to caustic soda, sodium carbonate or ammonia. It is not necessary, as a rule, to isolate the coloring matters before they are treated with an arylsulfonylchlorid, but it is possi- .ble to perform this reaction after their prep ara-tion in the same liquid.

The following examples serve to illustrate my invention i 1. The compound obtained by coupling 18.4 kg. of bcnzidim'after tetrazotizing it, with 30.3 kg. of naphthylamindisulfonic acid (2.3.6) and 9.3 kg. of phenol is mixed Specification of Letters Patent.

Patented July 22, 1913.

Application filed. November 7, 1912. Serial No. 730,042.

with water and 80 kg. of sodium carbonate. At a temperature of 303,53 .centigrade, 2% kg. of phenylsulfonychlorid to the formula are gradually added. The dye, which was partly dissolved,beco mes more yellow, and finally separates as a brilliant red precipitate which is isolated in the well known manner. This new azo dye dyes wool and silk an orange shade which is relatively fast to alkali, washing and milling. The dye thus produced has most probably the following formula:

N sOaNft I do nol. limit myself to the particular quantities of ingredients or to the stated alkalis or lempcrnluros of reaction mencorresponding tioned herein all of which may be varied without going beyond the scope ofmy 1nvention.

A fe additional azo dyes obtained in a simila r manner are shown table:

in following Azo dye used as starting material. Arylsulfofiylchlorid having been employed. ggi g g 001 p-Amido-dipnenylaminsulfonic-acid-azophenol .I p-Tolylsulfonylchlorid Greenish-yellow.

Amino R acid i I v Benzidin Chlorplienylsulfonylchlond Orange, Phenol Sulfophenylmetl1ylpyrazolone. I Benzidimmono-sulfonic-acid v Paratolylsnlfonylchlond Reddish-yellow.

Phenol V Sulfophenylmethylpyrazolone.. 1 v m-Tolidin p-Tolylsulfonylchlond Greenishyellow,

Phenol Naphtholdisulfonic-acid e... f Benzidin B-naphthylsulfonylchlorid Yellow-red.

Phenol Do .L Nitrophenylsulionylchlorid Do.

Naphtholdisulfonic-acid 1.3.6. V Benzidin p-Tolylsulfonylchlond Bluish-red,

Phenol Naphtholdisulfonic-acid 1.3.6.. 1 p-To1ylsulfonylchlond.. Yellowisli-red.

Phenol V V Phenol Diamidostilbenedisulfonic-acid p-Tolylsulfonylchlond Yellow.

\ Phenol AminoRacid.. I i v 7 Benzidin p-Tolylsulfonylchlorid Orange.

oCresol Naphtholdisnlfonic-acid G. Benzidin ..1 p-Tolylsulfonylchlorid....- Yellowish-red.

m-Cresol F Amino R acid. v v Benzidin p-Tolylsulfonylchlorid Orange.

p-Cresol Sulfani1ic-acid-azo-m-oxydinhenylamin p-Tolylsulfonylchlorid Yel1o\vish'-brown.

Phenol p-Phenylenedxannne p-Tolylsulfonylchlorid ..I Blue-violet.

Aminonaphtholdisulfonic-acid H.. p-Pheuylenediaminphenol combined in acid solution with p-Tolylsulfonylchlorid Blue-black.

aminonaphthol-disulfonic-aeid H and recombined in alkaline solution with diazotized analin.

p-Aminophenol-sulfophenylmethyl-pyrazolone .I p-Tolylsulfonylch1orid Yellow. N

Having thusdescribed my invention, what is claimed, is: l 1. The process of producing azo. dyes which consists in treating an azo dye containing a phenolic hydroxyl group with an arylsulfonylchlorid substantially as described. i 2. The process of producing azo dyes which consists in treating an azo dye containing a phenolic hydroxyl group with an arylsulfonylchlorid in the presence of an alkali, substantially as described.

3. As a new article of.manufacture, the azo dye produced by treating an azo dye an arylsulfonylchlorid in the presence of containing a phenolic hydroxyl group with alkali, which dye-stuff dyes animal or vegetable fibers yellow to blue black shades relatively fast to alkali, and which is in the form of a yellow to black powder, giving aminoarylesters of arylsulfonic acids with other compounds upon reduction with stannous chlorid and hydrochloric acid.

Signed at Basel in Switzerland this 23d 30 day of October AJD. 1912. I

BERNHARD RICHARD Witnesses GEO. Girronn, ARNOLD; ZUBER. 

